'use strict';

const constants = require('constants');
const tls = require('tls');

// Lazily loaded
var crypto = null;

const binding = process.binding('crypto');
const NativeSecureContext = binding.SecureContext;

function SecureContext(secureProtocol, flags, context) {
  if (!(this instanceof SecureContext)) {
    return new SecureContext(secureProtocol, flags, context);
  }

  if (context) {
    this.context = context;
  } else {
    this.context = new NativeSecureContext();

    if (secureProtocol) {
      this.context.init(secureProtocol);
    } else {
      this.context.init();
    }
  }

  if (flags) this.context.setOptions(flags);
}

exports.SecureContext = SecureContext;


exports.createSecureContext = function createSecureContext(options, context) {
  if (!options) options = {};
  var i;
  var len;

  var secureOptions = options.secureOptions;
  if (options.honorCipherOrder)
    secureOptions |= constants.SSL_OP_CIPHER_SERVER_PREFERENCE;

  var c = new SecureContext(options.secureProtocol, secureOptions, context);

  if (context) return c;

  // NOTE: It's important to add CA before the cert to be able to load
  // cert's issuer in C++ code.
  if (options.ca) {
    if (Array.isArray(options.ca)) {
      for (i = 0, len = options.ca.length; i < len; i++) {
        c.context.addCACert(options.ca[i]);
      }
    } else {
      c.context.addCACert(options.ca);
    }
  } else {
    c.context.addRootCerts();
  }

  if (options.cert) {
    if (Array.isArray(options.cert)) {
      for (i = 0; i < options.cert.length; i++)
        c.context.setCert(options.cert[i]);
    } else {
      c.context.setCert(options.cert);
    }
  }

  // NOTE: It is important to set the key after the cert.
  // `ssl_set_pkey` returns `0` when the key does not much the cert, but
  // `ssl_set_cert` returns `1` and nullifies the key in the SSL structure
  // which leads to the crash later on.
  if (options.key) {
    if (Array.isArray(options.key)) {
      for (i = 0; i < options.key.length; i++) {
        var key = options.key[i];

        if (key.passphrase)
          c.context.setKey(key.pem, key.passphrase);
        else
          c.context.setKey(key);
      }
    } else {
      if (options.passphrase) {
        c.context.setKey(options.key, options.passphrase);
      } else {
        c.context.setKey(options.key);
      }
    }
  }

  if (options.ciphers)
    c.context.setCiphers(options.ciphers);
  else
    c.context.setCiphers(tls.DEFAULT_CIPHERS);

  if (options.ecdhCurve === undefined)
    c.context.setECDHCurve(tls.DEFAULT_ECDH_CURVE);
  else if (options.ecdhCurve)
    c.context.setECDHCurve(options.ecdhCurve);

  if (options.dhparam) c.context.setDHParam(options.dhparam);

  if (options.crl) {
    if (Array.isArray(options.crl)) {
      for (i = 0, len = options.crl.length; i < len; i++) {
        c.context.addCRL(options.crl[i]);
      }
    } else {
      c.context.addCRL(options.crl);
    }
  }

  if (options.sessionIdContext) {
    c.context.setSessionIdContext(options.sessionIdContext);
  }

  if (options.pfx) {
    var pfx = options.pfx;
    var passphrase = options.passphrase;

    if (!crypto)
      crypto = require('crypto');

    pfx = crypto._toBuf(pfx);
    if (passphrase)
      passphrase = crypto._toBuf(passphrase);

    if (passphrase) {
      c.context.loadPKCS12(pfx, passphrase);
    } else {
      c.context.loadPKCS12(pfx);
    }
  }

  // Do not keep read/write buffers in free list
  if (options.singleUse) {
    c.singleUse = true;
    c.context.setFreeListLength(0);
  }

  return c;
};

exports.translatePeerCertificate = function translatePeerCertificate(c) {
  if (!c)
    return null;

  if (c.issuer) c.issuer = tls.parseCertString(c.issuer);
  if (c.issuerCertificate && c.issuerCertificate !== c) {
    c.issuerCertificate = translatePeerCertificate(c.issuerCertificate);
  }
  if (c.subject) c.subject = tls.parseCertString(c.subject);
  if (c.infoAccess) {
    var info = c.infoAccess;
    c.infoAccess = {};

    // XXX: More key validation?
    info.replace(/([^\n:]*):([^\n]*)(?:\n|$)/g, function(all, key, val) {
      if (key === '__proto__')
        return;

      if (c.infoAccess.hasOwnProperty(key))
        c.infoAccess[key].push(val);
      else
        c.infoAccess[key] = [val];
    });
  }
  return c;
};